Google Authenticator is a Audio & Multimedia::iPod software developed by Google, Inc.. After our trial and test, the software was found to be official, secure and free. Here is the official description for Google Authenticator: Google Authenticator works with 2-step verification for your Google Account to provide an additional layer of security when signing in.
Use Google Authenticator to generate verification codes directly on your phone, without the need for a network connection.
-Automatic setup via QR code
-Support for multiple accounts
-Support for time-based and counter-based code generation
To use Google Authenticator, you need to enable 2-step verification on your Google Account.
Requires iOS 3.1.3 or later. you can download Google Authenticator free now.